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Fabrication of CaTiO3 modified glassy carbon electrode-based hydrogen peroxide sensor 制作 CaTiO3 改性玻璃碳电极型过氧化氢传感器
IF 2.2 4区 化学 Q3 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2024-06-15 DOI: 10.1007/s13738-024-03058-y
Khursheed Ahmad, Theophile Niyitanga, Aarti Pathak, Rais Ahmad Khan, Mohd Quasim Khan

Herein, we reported the construction of hydrogen peroxide (H2O2) sensor using calcium titanate modified screen printed electrode (CaTiO3@SPE). The CaTiO3 has been synthesized via hydrothermal method using calcium nitrate tetrahydrate and titanium butoxide as the Ca and Ti source. The CaTiO3 was characterized by many physiochemical techniques such as powder X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDX), Brunauer–Emmett–Teller (BET) and scanning electron microscopy (SEM). The XRD analysis revealed the existence of decent crystalline nature in the synthesized material, while EDX results demonstrated its good phase purity. The SEM micrographs suggested that CaTiO3 has flakes-like surface structure. The BET results also indicated that CaTiO3 has specific surface area of 57.6 m2/g. Furthermore, CaTiO3 was used as the electrode material and CaTiO3@SPE has been constructed using drop-casting method. The fabricated CaTiO3@SPE was used for the sensing of H2O2 using cyclic voltammetry and linear sweep voltammetry methods. The CaTiO3@SPE exhibited reasonable limit of detection of 0.08 µM with good selectivity, stability and repeatability.

在此,我们报告了利用钛酸钙改性丝网印刷电极(CaTiO3@SPE)构建过氧化氢(H2O2)传感器的情况。钙钛矿是以四水硝酸钙和丁氧化钛为钙钛源,通过水热法合成的。粉末 X 射线衍射(XRD)、能量色散 X 射线光谱(EDX)、Brunauer-Emmett-Teller(BET)和扫描电子显微镜(SEM)等多种理化技术对 CaTiO3 进行了表征。XRD 分析表明合成材料具有良好的结晶性,而 EDX 结果则表明其具有良好的相纯度。扫描电镜显微照片显示 CaTiO3 具有片状表面结构。BET 结果也表明,CaTiO3 的比表面积为 57.6 m2/g。此外,CaTiO3 被用作电极材料,CaTiO3@SPE 采用滴铸方法制成。利用循环伏安法和线性扫描伏安法,将制备的 CaTiO3@SPE 用于检测 H2O2。CaTiO3@SPE 的检测限为 0.08 µM,具有良好的选择性、稳定性和重复性。
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引用次数: 0
An optimized smartphone-based colorimetric detection method for evaluating the fluoride released in tea extracts from different brewing conditions 基于智能手机的优化比色检测方法,用于评估不同冲泡条件下茶叶提取物中的氟释放量
IF 2.2 4区 化学 Q3 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2024-06-13 DOI: 10.1007/s13738-024-03057-z
Le-Thi Anh-Dao, Do Minh-Huy, Nguyen Thu-Huong, Vo-Thi Tuong-Thu, Nguyen-Thi Kim-Sinh, Nguyen Thanh-Nho, Nguyen Cong-Hau

A smartphone-based colorimetric detection method was optimized for measuring the fluoride content in tea extracts using zirconium-xylenol orange reagent. The images of the formed color complex in the presence of fluoride were captured and analyzed their color components through the RGB (Red, Green, Blue) vector values. To maintain the capturing conditions, a colorimetric box (150 × 70 × 90 mm) was self-designed by optimizing the smartphone camera-sample holder/cuvette distance and inside brightness. The calibration curve was constructed from 0.5 to 25 mg/L with the goodness of linearity (R2 > 0.995). Favorable repeatability and reproducibility were obtained (RSDr = 5.01% and RSDR = 5.02%), according to the Appendix F of AOAC (2016). UV–Vis and F ion-selective electrode were simultaneously conducted as reference methods for the developed smartphone-based method, demonstrating comparable fluoride content results in tea extracts obtained from these methods. Using 2.5 g tea brewed in 100 mL of deionized water at 90 °C for 60 min, a descending fluoride content order was achieved: black tea (3.31–3.85 mg/L) > oolong tea (2.38–2.65 mg/L) > green tea (2.25–2.97 mg/L) > white tea (2.28–2.31 mg/L). The smartphone-based method was also applied to evaluate the effects of different brewing conditions on the fluoride content in tea extracts, indicating the higher brewing temperature and prolonged time could accelerate the release of fluoride in tea extracts. This study provides a quality control tool for tea consumers and manufacturers as well as contributes to enrich the applications of smartphone-based methods in the food sections, especially for Vietnam with the diversity of agricultural products.

优化了一种基于智能手机的比色检测方法,该方法使用锆-二甲酚橙试剂测量茶叶提取物中的氟含量。捕捉氟化物存在时形成的彩色复合物图像,并通过 RGB(红、绿、蓝)矢量值分析其颜色成分。为保证捕捉条件,通过优化智能手机摄像头-样品架/比色皿的距离和内部亮度,自行设计了一个比色盒(150 × 70 × 90 毫米)。构建了 0.5 至 25 mg/L 的校准曲线,线性良好(R2 > 0.995)。根据 AOAC(2016 年)附录 F,获得了良好的重复性和再现性(RSDr = 5.01% 和 RSDR = 5.02%)。紫外可见光谱法和氟离子选择性电极法同时作为所开发的基于智能手机的方法的参比方法,结果表明这些方法得到的茶叶提取物中氟含量结果具有可比性。将 2.5 克茶叶放入 100 毫升去离子水中,在 90 °C 下冲泡 60 分钟,氟含量由高到低的顺序为:红茶(3.31-3.85 毫克/升);乌龙茶(2.38-2.65 毫克/升);绿茶(2.25-2.97 毫克/升);白茶(2.28-2.31 毫克/升)。该研究还应用智能手机方法评估了不同冲泡条件对茶叶提取物中氟含量的影响,结果表明,较高的冲泡温度和较长的冲泡时间可加速茶叶提取物中氟的释放。这项研究为茶叶消费者和制造商提供了一种质量控制工具,同时也有助于丰富基于智能手机的方法在食品领域的应用,尤其是在农产品种类繁多的越南。
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引用次数: 0
Fabrication of ZnO/Ag photocatalyst and its photocatalytic degradation properties on trimethylamine 氧化锌/银光催化剂的制备及其对三甲胺的光催化降解性能
IF 2.2 4区 化学 Q3 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2024-06-09 DOI: 10.1007/s13738-024-03055-1
Zhen Fan, Chunxia Li, Meijie Xu

ZnO/Ag nanocomposite was prepared via in situ method by using silver nitrate and ZnSO4 as the raw material. ZnO and ZnO/Ag were characterized by utilizing SEM, UV-vis, XRD, FTIR, and so on. The photocataytic degradation behaviors of ZnO and ZnO/Ag for trimethylamine (TEA) in air and solution were studied. The results indicated that ZnO/Ag had better photocatalytic degradation properties on trimethylamine under the condition of 0.06 g catalyst, 2 h photocatalytic time, and 15 A light intensity, and the degradation rates of TEA were up to 44 and 67% in air and solution, respectively. Furtherly, ZnO and ZnO/Ag also indicated perfect photocatalytic degradation properties toward to organic compounds in wastewater. Especially, the harmless treatment of triethylamine was achieved by using photocatalytic degradation method that provided a novel method for treating triethylamine. In all the above results leaded to a good application prospect of ZnO/Ag in the degradation of organic compounds in air and solution.

以硝酸银和 ZnSO4 为原料,通过原位法制备了 ZnO/Ag 纳米复合材料。利用 SEM、UV-vis、XRD、FTIR 等对 ZnO 和 ZnO/Ag 纳米复合材料进行了表征。研究了 ZnO 和 ZnO/Ag 在空气和溶液中对三甲胺(TEA)的光催化降解行为。结果表明,在 0.06 g 催化剂、2 h 光催化时间和 15 A 光强条件下,ZnO/Ag 对三乙胺具有更好的光催化降解性能,在空气和溶液中对三乙胺的降解率分别高达 44% 和 67%。此外,ZnO 和 ZnO/Ag 对废水中的有机化合物也具有完美的光催化降解性能。尤其是利用光催化降解方法实现了对三乙胺的无害化处理,为处理三乙胺提供了一种新方法。综上所述,ZnO/Ag 在降解空气和溶液中的有机化合物方面具有良好的应用前景。
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引用次数: 0
Hybrid photocatalytic/photochemical degradation of 1,2-dichlorobenzene: kinetic, thermodynamic, operating cost, synergism and mineralization study 光催化/光化学混合降解 1,2-二氯苯:动力学、热力学、运行成本、协同作用和矿化研究
IF 2.2 4区 化学 Q3 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2024-06-05 DOI: 10.1007/s13738-024-03044-4
Ali Reza Soleymani, Saeid Azimi, Azin Rahnama

This study investigates the combined effects of UV/TiO2 and UV/H2O2 processes on the degradation of 1,2-dichlorobenzene in aqueous media, employing a recycled current photo-reactor equipped with a water jacket. Evaluation of various factors—initial pH, TiO2 dosage, initial H2O2 concentration, pollutant concentration, and temperature—contributed to the optimization of degradation rates and operational costs for both processes. For the degradation of 50 mg/L of DCB, the optimal operating conditions were found to be for UV/TiO2: pH = 3, [TiO2] = 30 mg/L and T = 25 °C, and for UV/H2O2: pH = 3, [H2O2]0 = 350 mg/L and T = 25 °C. After 60 min of irradiation time, the degradation efficiency, pseudo first order rate constant and operational cost value for the UV/TiO2 and UV/H2O2 processes were as 98.9%, 0.0771 min−1, 11.6 $/m3 and 96.3%, 0.0573 min−1, 11.8 $/m3 respectively. Also, thermodynamic parameters of activation energy, enthalpy change, entropy change and standard Gibbs free energy were calculated as 21.78 (kJ/mol), 19.37 (kJ/mol), − 0.20 (kJ/mol K) and 73.34 (kJ/mol at 25 °C) for UV/TiO2 process and 7.62 (kJ/mol), 5.18 (kJ/mol), − 0.25 (kJ/mol K) and 80.14 (kJ/mol at 25 °C) for UV/H2O2 process. The investigation also encompassed the exploration of 13 hybridization scenarios, including UV/TiO2/H2O2 and UV/H2O2/TiO2, revealing notable findings. Notably, a specific hybridization scenario, namely UV/TiO2 (30 mg/L)/H2O2(250 mg/L), demonstrated a significant synergistic effect (29.5%). Evaluating pollutant mineralization unveiled compelling results, with approximately 85% mineralization achieved after 90 min for the UV/TiO2(30 mg/L)/H2O2(250 mg/L) scenario, showcasing a remarkable synergism (44%) in the mineralization process.

Graphical abstract

本研究采用配备水套的循环电流光反应器,研究了紫外线/二氧化钛和紫外线/H2O2 工艺对水介质中 1,2-二氯苯降解的综合影响。对各种因素(初始 pH 值、TiO2 用量、初始 H2O2 浓度、污染物浓度和温度)的评估有助于优化两种工艺的降解率和运行成本。在降解 50 mg/L 的 DCB 时,发现紫外线/二氧化钛的最佳操作条件为:pH = 3,[TiO2] = 30 mg/L,T = 25 °C;紫外线/二氧化硫的最佳操作条件为:pH = 3,[H2O2]0 = 350 mg/L,T = 25 °C。辐照 60 分钟后,UV/TiO2 和 UV/H2O2 过程的降解效率、假一阶速率常数和运行成本值分别为 98.9%、0.0771 min-1、11.6 美元/立方米和 96.3%、0.0573 min-1、11.8 美元/立方米。计算得出的活化能、焓变、熵变和标准吉布斯自由能等热力学参数分别为 21.78 (kJ/mol), 19.37 (kJ/mol), - 0.20 (kJ/mol K) 和 73.34 (kJ/mol at 25 °C);紫外线/二氧化钛过程为 7.62 (kJ/mol), 5.18 (kJ/mol), - 0.25 (kJ/mol K) 和 80.14 (kJ/mol at 25 °C)。这项研究还探讨了 13 种杂化情况,包括 UV/TiO2/H2O2 和 UV/H2O2/TiO2,并得出了显著的发现。值得注意的是,紫外线/二氧化钛(30 毫克/升)/二氧化氢(250 毫克/升)这一特定的杂化方案显示出显著的协同效应(29.5%)。污染物矿化评估结果令人信服,紫外线/二氧化钛(30 毫克/升)/二氧化硫(250 毫克/升)方案在 90 分钟后实现了约 85% 的矿化,显示了矿化过程中显著的协同效应(44%)。
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引用次数: 0
A comparative study of X-ray structural analysis, DFT computations, and Hirshfeld surface analysis for decahydroacridine-1,8-diones 十氢吖啶-1,8-二酮的 X 射线结构分析、DFT 计算和 Hirshfeld 表面分析比较研究
IF 2.2 4区 化学 Q3 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2024-06-04 DOI: 10.1007/s13738-024-03045-3
Fatemeh S. Hosseininasab, Hamid R. Memarian, Hadi Amiri Rudbari, Olivier Blacque

Crystal structure analysis and DFT computational calculation of two symmetrical and unsymmetrical decahydroacridine-1,8-diones (DHACs) were carried out to elucidate the effect of the aryl-substituted heterocyclic core in these compounds on the comparative bond lengths, bond, and dihedral angles. According to these findings, the central heterocyclic ring in these compounds is exhibited in the pseudo-boat conformation, in which the aryl substitution occupies the pseudo-axial position. Moreover, the fused outer rings were in the twisted half-chair conformation. The weak and strong inter- and intramolecular interactions between the suitable donor–acceptor positions (N‒H···O, C‒H···O, H‒N···H and C‒H···π of the C=C double bond) in symmetrical and enantiomeric pairs of unsymmetrical DHACs affect the orientation of the molecules in the crystal packing. The relative contributions of various intermolecular interactions in these compounds are evaluated using Hirshfeld surface analysis. The DFT calculations were performed to outline the optimized structure, molecular electrostatic potential (MEP), frontier molecular orbitals (FMOs), natural bond orbital (NBO) and to elucidate the effect of the space orientation of the attached aryl ring toward the heterocyclic ring on the total energy content of DHAC 2. Additionally, MEP analysis in DHAC 2 revealed that the negative electrostatic potential is more concentrated around the O1-atom of the C1=O1 double bond than the O2-atom of the C13=O2 double bond. The results of the NBO analysis demonstrated that in the crystal packing of compounds 1 and 2 the strongest intermolecular interaction occurs from the LP(2)O2 to σ*(N1–H) and LP(1)O1 to σ*(N1‒H), respectively.

对两种对称和不对称的十氢吖啶-1,8-二酮(DHACs)进行了晶体结构分析和 DFT 计算,以阐明这些化合物中芳基取代的杂环核心对比较键长、键角和二面角的影响。根据这些发现,这些化合物中的中心杂环呈假舟构象,其中芳基取代占据假轴位置。此外,融合的外环呈扭曲的半对椅构象。对称和非对称 DHAC 对映体中合适的供体-受体位置(C=C 双键的 N-H--O、C-H--O、H-N-H 和 C-H--π)之间的分子间和分子内弱相互作用会影响分子在晶体堆积中的取向。利用 Hirshfeld 表面分析评估了这些化合物中各种分子间相互作用的相对贡献。通过 DFT 计算勾勒出了 DHAC 2 的优化结构、分子静电位 (MEP)、前沿分子轨道 (FMO)、天然键轨道 (NBO),并阐明了附着芳基环朝向杂环的空间取向对 DHAC 2 总能量含量的影响。此外,DHAC 2 的 MEP 分析表明,负静电势更集中在 C1=O1 双键的 O1 原子周围,而不是 C13=O2 双键的 O2 原子周围。NBO 分析结果表明,在化合物 1 和 2 的晶体结构中,最强的分子间相互作用分别发生在 LP(2)O2 到 σ*(N1-H) 和 LP(1)O1 到 σ*(N1-H)之间。
{"title":"A comparative study of X-ray structural analysis, DFT computations, and Hirshfeld surface analysis for decahydroacridine-1,8-diones","authors":"Fatemeh S. Hosseininasab,&nbsp;Hamid R. Memarian,&nbsp;Hadi Amiri Rudbari,&nbsp;Olivier Blacque","doi":"10.1007/s13738-024-03045-3","DOIUrl":"10.1007/s13738-024-03045-3","url":null,"abstract":"<div><p>Crystal structure analysis and DFT computational calculation of two symmetrical and unsymmetrical decahydroacridine-1,8-diones (DHACs) were carried out to elucidate the effect of the aryl-substituted heterocyclic core in these compounds on the comparative bond lengths, bond, and dihedral angles. According to these findings, the central heterocyclic ring in these compounds is exhibited in the <i>pseudo-boat</i> conformation, in which the aryl substitution occupies the <i>pseudo-axial</i> position. Moreover, the fused outer rings were in the twisted half-chair conformation. The weak and strong inter- and intramolecular interactions between the suitable donor–acceptor positions (N‒H···O, C‒H···O, H‒N···H and C‒H···π of the C=C double bond) in symmetrical and enantiomeric pairs of unsymmetrical DHACs affect the orientation of the molecules in the crystal packing. The relative contributions of various intermolecular interactions in these compounds are evaluated using Hirshfeld surface analysis. The DFT calculations were performed to outline the optimized structure, molecular electrostatic potential (MEP), frontier molecular orbitals (FMOs), natural bond orbital (NBO) and to elucidate the effect of the space orientation of the attached aryl ring toward the heterocyclic ring on the total energy content of DHAC <b>2</b>. Additionally, MEP analysis in DHAC <b>2</b> revealed that the negative electrostatic potential is more concentrated around the O<sub>1</sub>-atom of the C<sub>1</sub>=O<sub>1</sub> double bond than the O<sub>2</sub>-atom of the C<sub>13</sub>=O<sub>2</sub> double bond. The results of the NBO analysis demonstrated that in the crystal packing of compounds <b>1</b> and <b>2</b> the strongest intermolecular interaction occurs from the LP(2)O<sub>2</sub> to σ*(N<sub>1</sub>–H) and LP(1)O<sub>1</sub> to σ*(N<sub>1</sub>‒H), respectively.</p></div>","PeriodicalId":676,"journal":{"name":"Journal of the Iranian Chemical Society","volume":"21 7","pages":"1997 - 2015"},"PeriodicalIF":2.2,"publicationDate":"2024-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141254210","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Palladium mediated domino heck redox cyclization of aromatic homoallylic alcohols to methylindanones 钯介导的芳香族均烯丙基醇与甲基茚酮的多米诺环氧化还原反应
IF 2.2 4区 化学 Q3 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2024-06-03 DOI: 10.1007/s13738-024-03053-3
Vivek K. Mishra, Martin E. Maier, Manish Tiwari

3-Methyl indanones are key synthetic building blocks for a variety of natural and useful synthetic compounds. Their synthesis is exceedingly difficult. Herein, we described a palladium (II) mediated intramolecular one-pot redox-relay cyclization of aromatic homoallylic alcohols to cyclic keto compounds. This catalytic system enabled direct conversion of homoallylic alcohols to corresponding indanones (3-methyl-1-indanones). Homoallylic alcohols were synthesized by reacting allyl magnesium bromide with corresponding aromatic aldehydes. The optimized reaction yielded up to 88% 3-methylindanones. Our findings enabled us to device a plausible mechanism for this one pot reaction.

Graphical Abstract

3-甲基茚酮是多种天然和有用合成化合物的关键合成构件。它们的合成极其困难。在此,我们介绍了一种由钯(II)介导的分子内一锅氧化还原-继电器环化芳香族均烯丙基醇到环酮化合物的方法。该催化系统可将均烯丙基醇直接转化为相应的茚酮类化合物(3-甲基-1-茚酮酮)。均烯丙基醇是通过烯丙基溴化镁与相应的芳香醛反应合成的。优化后的反应产生了高达 88% 的 3-甲基茚满酮。我们的研究结果使我们能够为这一一锅反应设计出合理的机理。
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引用次数: 0
Study of photophysical properties in bronsted acids for nitrogen atoms with different hybrid (sp, sp2, sp3) orbitals 研究具有不同杂化(sp、sp2、sp3)轨道的氮原子在支链烷酸中的光物理特性
IF 2.2 4区 化学 Q3 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2024-06-02 DOI: 10.1007/s13738-024-03048-0
Zhou Wang, Kaibo Hu, Chichong Lu, Guofan Jin

Fluorescent tiny molecules that are resistant to acid have long been the center of interest. The nitrogen atoms on benzyl cyanide were sp hybridized, while the two nitrogen atoms at pyrimidine were sp2 hybridized in the primary structure that we constructed. With the addition of a protonic acid (H2SO4, CH3SO3H, and HF), the nitrogen atoms at acridine underwent sp3 hybridization, which caused the hydrogen protons to interact with the three types of nitrogen atoms to varying degrees. This distribution of the electron cloud density led to a decrease in fluorescence emission. Furthermore, Gaussian 09 software and DFT calculations were used to model its orbital conformation, which is the highest occupied molecular orbital—lowest unoccupied molecular orbital (HOMO–LUMO). Furthermore, its crystal structure was assigned to the orthorhombic system with stronger non-homogeneity (a = 8.9160 (4) Å, b = 44.289 (3) Å, c = 9.6131 (7) Å, α = 90°, β = 90°, γ = 90°, V = 3796.0 (4) Å3, z = 4, Dc = 1.244 g/cm3).

Graphical abstract

长期以来,耐酸的荧光小分子一直是人们关注的焦点。在我们构建的一级结构中,苄基氰化物上的氮原子是 sp 杂化的,而嘧啶上的两个氮原子是 sp2 杂化的。加入质子酸(H2SO4、CH3SO3H 和 HF)后,吖啶上的氮原子发生 sp3 杂化,这导致氢质子与三种氮原子发生不同程度的相互作用。电子云密度的分布导致荧光发射减弱。此外,研究人员还利用高斯 09 软件和 DFT 计算来模拟其轨道构象,即最高占有分子轨道-最低未占有分子轨道(HOMO-LUMO)。此外,其晶体结构被归入具有较强非均质性的正交体系(a = 8.9160 (4) Å, b = 44.289 (3) Å, c = 9.6131 (7) Å, α = 90°, β = 90°, γ = 90°, V = 3796.0 (4) Å3, z = 4, Dc = 1.244 g/cm3)。
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引用次数: 0
Enhancing textile wastewater decolorization: harnessing the power of diverse oxidants in photo-oxidation process with response surface methodology 提高纺织废水的脱色能力:利用响应面方法在光氧化过程中使用多种氧化剂
IF 2.2 4区 化学 Q3 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2024-06-02 DOI: 10.1007/s13738-024-03051-5
Shayan Nadafahadi, Hasti Hasheminejad

In the photo-oxidation processes, the oxidants play a vital role in removing color. However, a comprehensive comparison of the three common oxidants’ performance for color removal from textile wastewater has not been conducted. Also, the effect of periodate in the presence of ferrous for color removal has not been investigated extensively. The object of this study was to evaluate and compare the effect of three common oxidants on the removal of color. Central composite design was employed to design the experiments and evaluate the interaction between parameters and their impact on color removal. The photo-oxidation processes were carried out under UV light irradiation (60 W) in the presence of ferrous (Fe2+) and three oxidants, namely hydrogen peroxide (H2O2), sodium persulfate (SPS), and sodium periodate (SPI). The four main variables were the reaction time, the pH value, the concentration of oxidants, and the concentration of ferrous. Finally, the optimal values for all parameters were shown and these three processes were compared with each other. Although the UV/SPI/Fe2+ process had the highest color removal (96%), by considering all parameters, the UV/SPS/Fe2+ was a better choice because of its high efficiency, low reaction time, and low oxidant concentration. The results suggested that the photo-Fenton process could not be a good option among these processes, as it required the longest reaction time and highest oxidant concentration while achieving the lowest removal efficiency (82%). The results of this study can help with the decision-making process to select a better process for textile wastewater treatment.

在光氧化过程中,氧化剂在去除颜色方面起着至关重要的作用。然而,目前还没有对三种常见氧化剂去除纺织废水中色素的性能进行全面比较。此外,高碘酸盐在亚铁存在下的除色效果也未得到广泛研究。本研究的目的是评估和比较三种常见氧化剂的除色效果。实验设计采用了中心复合设计,并评估了参数之间的相互作用及其对色素去除的影响。光氧化过程是在紫外光(60 W)照射下,在亚铁(Fe2+)和三种氧化剂(即过氧化氢(H2O2)、过硫酸钠(SPS)和高碘酸钠(SPI))的存在下进行的。四个主要变量是反应时间、pH 值、氧化剂浓度和亚铁浓度。最后,显示了所有参数的最佳值,并对这三种工艺进行了比较。虽然 UV/SPI/Fe2+ 工艺的色素去除率最高(96%),但考虑到所有参数,UV/SPS/Fe2+ 由于效率高、反应时间短、氧化剂浓度低而成为更好的选择。结果表明,在这些工艺中,光-芬顿工艺并不是一个好的选择,因为它需要的反应时间最长,氧化剂浓度最高,而去除效率却最低(82%)。这项研究的结果有助于决策过程,为纺织废水处理选择更好的工艺。
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引用次数: 0
Synthesis, crystal structure, thermal analysis, Hirshfeld surface analysis and density functional theory study of Ru3(CO)9(µ-Ph2AsCH2AsPh2)(AsPh3) Ru3(CO)9(µ-Ph2AsCH2AsPh2)(AsPh3) 的合成、晶体结构、热分析、Hirshfeld 表面分析和密度泛函理论研究
IF 2.2 4区 化学 Q3 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2024-06-01 DOI: 10.1007/s13738-024-03047-1
Husna Izzati Muhammad Nor Azharan, Siti Syaida Sirat, Enis Nadia Md Yusof, Mohd Mustaqim Rosli, Suhana Arshad, Noor Hidayah Pungot

The reaction of Ru3(CO)10(µ-Ph2AsCH2AsPh2) and arsine ligand (AsPh3) afforded a new triruthenium cluster derivative, Ru3(CO)9(µ-Ph2AsCH2AsPh2)(AsPh3) (1). 1 was synthesised and characterised by elemental analysis, Fourier transform infrared, 1H nuclear magnetic resonance (NMR) and 13C{1H} NMR spectroscopy. The molecular structure of 1 was confirmed by single crystal X-ray diffraction (SXRD) analysis. The compound features a bidentate ligand of Ph2AsCH2AsPh2 and a monodentate ligand of AsPh3 that occupy the equatorial positions at Ru atoms. The thermal decomposition of 1 investigated by the thermogravimetric-differential thermogravimetric (TG-DTG) technique involves three stages, with the final product being Ru atoms with a residual rate of 18.60% (calcd: 18.41%). Density functional theory (DFT) calculations were performed using the B3LYP hybrid exchange–correlation functional method, and the LanL2DZ pseudopotential on Ru with 6-31G basis was set for all other atoms. Assessment of bond lengths and angles between SXRD and DFT data demonstrated consistent values within expected ranges. Frontier molecular orbitals analysis and molecular electrostatic potential were also illustrated. The 2D fingerprint plot of Hirshfeld surface analysis reveals that H···H contact dominates the population with 38%. The interplay of intermolecular C–H···O hydrogen bond and C–H···π interactions were found to be effective in stabilizing the molecular structure.

Ru3(CO)10(µ-Ph2AsCH2AsPh2) 和砷化氢配体 (AsPh3) 反应生成了一种新的三钌簇衍生物 Ru3(CO)9(µ-Ph2AsCH2AsPh2)(AsPh3)(1)。1 是通过元素分析、傅立叶变换红外光谱、1H 核磁共振 (NMR) 和 13C{1H} NMR 光谱合成和表征的。NMR 光谱。单晶 X 射线衍射(SXRD)分析证实了 1 的分子结构。该化合物具有 Ph2AsCH2AsPh2 双齿配体和 AsPh3 单齿配体,它们占据了 Ru 原子的赤道位置。采用热重-差热重(TG-DTG)技术研究的 1 的热分解过程分为三个阶段,最终产物为 Ru 原子,残余率为 18.60%(计算值:18.41%)。密度泛函理论(DFT)计算采用 B3LYP 混合交换相关函数法,所有其他原子均以 6-31G 为基础的 LanL2DZ 伪势计算。对 SXRD 和 DFT 数据之间的键长和角度进行的评估表明,其值在预期范围内保持一致。前沿分子轨道分析和分子静电位也得到了说明。Hirshfeld 表面分析的二维指纹图显示,H--H 接触占总数量的 38%。研究发现,分子间 C-H-O 氢键和 C-H-π 相互作用可有效稳定分子结构。
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引用次数: 0
Insight into copper and iron ion sequestration from liquid-phase environment by microcrystalline cellulose biosorbent: experimental and modelling analyses 微晶纤维素生物吸附剂从液相环境中吸附铜离子和铁离子的洞察力:实验和模型分析
IF 2.2 4区 化学 Q3 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2024-05-31 DOI: 10.1007/s13738-024-03049-z
Mohammad Abdullah, Luqman Chuah Abdullah, Abel Adekanmi Adeyi, Siti Nurul Ain Md Jamil, Thomas Shean Yaw Choong, Rohah A. Majid

The paper assesses batch system microcrystalline cellulose (MCC) adsorptive ability for copper and iron uptake from aquatic environment. Field emission scanning electron microscope (FESEM), point zero charge and Fourier transform infrared (FTIR) spectroscopy were used to examine the physicochemical and morphological features of MCC. The batch system of the sequestration progression for the elimination of Cu(II) and Fe(II) was used by varying the solution pH, MCC doses, initial copper and iron concentration, and resident time. The maximum removal percentage for Cu(II) and Fe(II) were 99.5% and 96.4%, respectively, at pH 7. The influence of MCC dosage showed the 1.0 g/L of adsorbents results the highest percentage of Cu(II) (99.8%) and Fe(II) (88.63%) correspondingly. Equilibrium data for both metals were well fitted with both Langmuir and Freundlich isotherms, representing monolayer and multilayer adsorption systems. The maximum sorption capacity of MCC was 534.61 mg/g and 845.75 mg/g, respectively, for Cu(II) and Fe(II) ions at room temperature. Pseudo-second-order model best describes the copper and iron kinetic data, signifying the dominance of chemisorption adsorption relation between the negatively charged MCC and adsorbates. After four successive regeneration cycles, the MCC polymer maintained its maximal adsorption capacity, demonstrating effective copper and iron ion separation from aqueous solution. According to the study’s findings, poisonous heavy metals can be successfully removed from aquatic environments using eco-friendly microcrystalline cellulose.

本文评估了批处理系统微晶纤维素(MCC)吸附水生环境中铜和铁的能力。采用场发射扫描电子显微镜(FESEM)、零点电荷和傅立叶变换红外光谱(FTIR)研究了微晶纤维素的物理化学和形态特征。通过改变溶液 pH 值、MCC 剂量、铜和铁的初始浓度以及驻留时间,采用批次法对 Cu(II)和 Fe(II)进行去除。在 pH 值为 7 时,铜(II)和铁(II)的最大去除率分别为 99.5%和 96.4%;在 MCC 剂量的影响下,1.0 g/L 的吸附剂对铜(II)和铁(II)的去除率最高,分别为 99.8%和 88.63%。这两种金属的平衡数据都与 Langmuir 和 Freundlich 等温线非常吻合,分别代表单层和多层吸附系统。室温下,MCC 对铜(II)和铁(II)离子的最大吸附容量分别为 534.61 毫克/克和 845.75 毫克/克。伪二阶模型最好地描述了铜和铁的动力学数据,表明带负电荷的 MCC 与吸附剂之间的化学吸附关系占主导地位。经过连续四个再生周期后,MCC 聚合物仍能保持其最大吸附能力,这表明它能有效地从水溶液中分离铜离子和铁离子。研究结果表明,使用环保型微晶纤维素可成功去除水生环境中的有毒重金属。
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Journal of the Iranian Chemical Society
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